大腿骨骨体部横断面の断面特性値(1部 ヒトのバイオメカニクス)

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概要

• 論文の詳細を見る

• This paper presents the geometrical data for the human femoral shaft. Geometrical properties of the cross section from 13 sites along the bone length (from 20-80% in 5% increments) on each of 31 femoral shafts were calculated by using a digitizing unit and on-line microcomputer. More than 400 cross sections were analyzed in terms of L (circumference), A (gross cortical area), IX (area moment of inertia about the medio-lateral axis), IY (area moment of inertia about the antero-posterior axis), I1 (major principal moment of inertia), I2 (minor principal moment of inertia), IP (polar moment of inertia), PA (orientation of the major principal axis), and SI (section index). SI is a newly defined index: [numerical formula], which represents the deviation of mass distribution of cortical bone in the cross section or the flatness. The results indicate some general tendencies of the change in geometrical properties as a function of the position along the shaft, although there can be found considerable variability in quantity. (1) IY tapers distally in the middle third of the shaft, while IX remains constant along the length of the shaft. Different patterns of the change in the area moments of inertia about the antero-posterior and medio-lateral axes as a function of the section level are expected to correspond to the "structure of uniform strength", if one accepts Pauwels' simplified equilibrium model of lower limb bones in the frontal and sagittal planes; change of IY and IX is similar to that of the bending moments in the two planes. As a result, however, the marginal bending stress inferred in the frontal plane by Pauwels turns out to be incorrect because of the "structure of uniform strength". (2) There exists torsion of the shaft in most of the femurs examined in this study. SI indicates strong flatness at the subtrochanteric region and distal end of the shaft. The variance of PA becomes mimimal at the same regions. These findings suggest local morphological directivities which may involve mechanical significances related to torsion of the femoral neck and rotation of the knee joint. (3) Sex and agerelated differences of the properties normalized by the whole length of the femur were also discussed.

• バイオメカニズム学会の論文
• 1982-08-30

著者

• 高橋 秀雄

  東京大学

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• 大腿骨に生じる応力と骨形態との関連性(1部 生体を知る)
• 大腿骨骨体部横断面の断面特性値(1部 ヒトのバイオメカニクス)

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